//传入的是时间戳 转换成 现在的时间字符串
// 2019-9-9  
function fmtDate(obj){
    var date =  new Date(obj);
    var y = 1900+date.getYear();
    var m = "0"+(date.getMonth()+1);
    var d = "0"+date.getDate();
    return y+"-"+m.substring(m.length-2,m.length)+"-"+d.substring(d.length-2,d.length);
}